Here is how you can convert date to seconds:
Step 1.Convert date string to object using date()
let d = new Date('2022-07-05 08:36:33');
Step 2. Convert date object to milliseconds by using getTime()
d.getTime()
Step 3. Divide the result by 1000 to convert milliseconds to seconds
d.getTime() / 1000
All together:
let d = new Date('2022-07-05 08:36:33');
let secs = d.getTime() / 1000;
console.log(secs)